Docs: Create a "Linked items" page

• Start this issue's title with Docs: or Docs feedback:.

Problem to solve

The Linked items widget in work items is shared between different work item types, like tasks, OKRs, epics, and soon issues.

I propose creating a page called Linked items:

1. MVC 1 (this issue)

   From the new page, link to:

   • https://docs.gitlab.com/user/project/issues/related_issues.html
   • https://docs.gitlab.com/user/group/epics/linked_epics.html
   • https://docs.gitlab.com/user/tasks.html#linked-items-in-tasks
   • https://docs.gitlab.com/user/okrs.html#linked-items-in-okrs

   MR: Create a "Linked items" page (!184827 - merged)

   Live URL

   https://docs.gitlab.com/user/work_items/linked_items/

2. MVC 2 (new issue)

   When epics and issues are fully migrated and the steps are the same, move the main steps to the new page and deprecate the other pages.

Who can address the issue

@msedlakjakubowski

Other links/references

Docs IA: Reorganize the "Plan and track work" s... (&16344 - closed)